02 Envoy surging and bucking at acceleration - Page 2 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #11  
Old 02-06-2019, 03:19 PM
Sssigning Sssigning is offline
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They should be here saturday, I'll keep updating.
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  #12  
Old 02-10-2019, 07:26 PM
Sssigning Sssigning is offline
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Ok injectors in, better not fixed. Did compression test 190 on 1-5 180 on #6 added bit of oil, compression increased.
Still stuttering 75% of the time. I have pics can load soon
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  #13  
Old 02-10-2019, 11:29 PM
Scout356 Scout356 is offline
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I was having bucking and surging on my 2003 EXT LT 4.2. I took out my cat and replaced it with a exact fit cat from advanced auto and It solved the surging and bucking but now it feels like it has a misfire and smells way too rich...
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  #14  
Old 02-11-2019, 08:39 AM
Sssigning Sssigning is offline
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Can you tell me your symptoms that lead you to change cat? Im thinking this is where i'm headed, but do not want to keep throwing money
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  #15  
Old 02-11-2019, 11:19 AM
Sssigning Sssigning is offline
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Update: removed and unexpected VVT Solenoid. Looked good, cleaned, reinstalled. No change. Note: Truck runs better when it gets to operating temperature. Not great, better than when cold. Leaning towards exhaust system??
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  #16  
Old 02-11-2019, 01:04 PM
Scout356 Scout356 is offline
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The reason i took the cat out was because i had a airleak in my exaust manifold due to it not being able to get rid of the exaust. Plus my vehical has probably around 300,000 on it with stock cat. And also my engine didnt not want to climb in rpms at all. Max rpms were like 2,000 and after 2g it fell on its face. If your gonna look at the cat as a possable cause probably just unbolt/ loosen the bolts on the exaust pipe to the header to allow for better airflow. If it performs better id either cut the cat out and weld it back together or replace it. Mine has its power back but still runs like crap
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  #17  
Old 02-11-2019, 01:06 PM
Scout356 Scout356 is offline
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And by airleak in the manifold it blew by the manifold gasket and when it build more pressure from more rpm it made a lowd whistle like noise
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  #18  
Old 02-13-2019, 12:14 PM
Sssigning Sssigning is offline
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SOLVED SOLVED YEAH
Replac the VSS that was easy to do. 10 minutes 20 bucks. Checked all coil, 2 had bad BOOTS they were loose. Running like a champ! 18.8 mpg on freeway doing 70mpg. Don't trust DISCOUNT coils!
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  #19  
Old 02-13-2019, 12:47 PM
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wcosh wcosh is offline
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2003 Chevy TrailBlazer LT EXT
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Pretty much explains why I always carry a spare coil
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  #20  
Old 02-13-2019, 05:40 PM
Scout356 Scout356 is offline
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So i got my trailblazer running great. Everything i checked amd or did was i replaced the catilitic converter, exaust doughnut, exaust manifold gasket, intake manifold gasket, valve cover gasket, i checked both o2 sensors, MAP sensor, and the variable valve solenoid, and replaced all spark plugs. I have no clue what i did to fix it but the battery was unplugged for like 2 days so it did have plenty of reboot time. I also did heat up the o2 sensors almost white hot (the outside casing not the sensor its self) and i did clean the valve cover and intake manifold and throttle body while they were off of the engine. If you have any questions on how i did something ill do my best to answer
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